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pneu•mat•o•phore

Pronunciation: (noo-mat'u-fôr", -fōr", nyoo-, nOO'mu-tu-, nyOO'-),[key]—n.1. Bot.a specialized structure developed from the root in certain plants growing in swamps and marshes, serving as a respiratory organ.
2. Zool.the air sac of a siphonophore, serving as a float.